CAJ | 학술논문

塞块式量热计是热结构试验中常用的热流传感器，其侧向传热是测量误差的重要来源。在对塞块式量热计传热分析的基础上，设计了一种改进型隔热结构，并提出了一种基于半无限大体假定的热损失修正方法。通过建立塞块式量热计的有限元数值模型，分析了量热塞与隔热材料的接触热阻对数据处理结果的影响，在接触热阻较大时（R＝1×10-3 m2·K/W），未修正时最大测量误差不超过-9％，而修正后最大误差超过了20％；在接触热阻较小时（R＝1×10-4 m2·K/W），未修正时的最大测量误差约-20％，修正后则不大于1．5％。可见该修正方法只适用于接触热阻较小的情况。。数值模拟结果还表明，在隔热层表面附近增加金属尖楔的改进型结构，隔热材料最高温度从超过2000℃降低到300℃以下，有利于保护隔热材料不被烧损，间楔与传感器之间的换热面积只有总侧向面积的约2．9％，两者之间的换热几乎不影响数据处理方法的选择。
새괴식량열계시열결구시험중상용적열류전감기，기측향전열시측량오차적중요래원。재대새괴식량열계전열분석적기출상，설계료일충개진형격열결구，병제출료일충기우반무한대체가정적열손실수정방법。통과건립새괴식량열계적유한원수치모형，분석료량열새여격열재료적접촉열조대수거처리결과적영향，재접촉열조교대시（R＝1×10-3 m2·K/W），미수정시최대측량오차불초과-9％，이수정후최대오차초과료20％；재접촉열조교소시（R＝1×10-4 m2·K/W），미수정시적최대측량오차약-20％，수정후칙불대우1．5％。가견해수정방법지괄용우접촉열조교소적정황。。수치모의결과환표명，재격열층표면부근증가금속첨설적개진형결구，격열재료최고온도종초과2000℃강저도300℃이하，유리우보호격열재료불피소손，간설여전감기지간적환열면적지유총측향면적적약2．9％，량자지간적환열궤호불영향수거처리방법적선택。
Slug calorimeter is widely used in thermal protection tests,and lateral heat conduc-tion is one of the most important sources of heat flux measurement error using a slug calorime-ter.An improved adiabatic structure is designed based on slug calorimeter heat transfer analysis, and a heat loss correction method is proposed based on semi-infinite body assumption.FEA(Fi-nite Element Analysis)model is developed to study effects of thermal contact resistance (TCR) between the slug and the adiabatic structure on data reduction results.If TCR is large (R= 1 × 10-3 m2 ·K/W),the max measurement error is less than-9% without correction and more than 20% with correction.On the other hand,when TCR is small (R= 1 ×10-4 m2 ·K/W),the error is about-20% without correction and less than 1 .5% with correction.It is concluded that the correction method can only used in the situation when TCR can be neglected.Numerical simula-tion results also show that using the improved structure with a metal sharp wedge structure add-ed near the surface of adiabatic layer,the max temperature of adiabatic material decreases from o-ver 2000℃ to less than 300℃,which means that with the improved structure,the adiabatic ma-terial is protected efficientlly from ablation.The heat transfer area between the metal wedge and the slug is only about 2 .9% of the total lateral area,which hardly effects selection of data reduc-tion methods.